Car-truck



E. LATSI-IIAW.

CAR TRUCK.

APPLICATION FILED NOV 23, 1920.

1,371,695, PatentedMar.15,19 21.

4 7 IINVENTOR lgzmerfazakw BY lmogv I:

UNITED srArss rArNT oF Fl Y ELMER LATSHAW, or PHILAnELrHIA, rEN sYL ANIA, AssreNon TO THE J. G. BRILL COMPANY, or PHILADELPHIA, PENNSYLVANIA, A CORPORATION or PENNSYL- VA IA.

CARTRUCK.

Specification of Letters Patent. P m t -Q15, 1921,

Application filed November 23, 1920. Serial --No. 425,952.

To all whom it may concern:

Be it known thatI, Emma LA'rsHAw, a citizen of the United States, and a resident of the city and county of Philadelphia, State of Pennsylvania, have invented a certain new and useful Improvement in Car-Trucks, of which the following is a specification.

My invention relates to a bolster supporting means for car trucks wherein the bolster is supported on leaf springs and said leaf springs are so arranged that they will carry light loads resiliently as well as heavy loads, whereby the car has comfortable and easy riding qualities under all conditions of service.

lVith these objects and other objects which may hereinafter appear in view, I have devised the particular arrangement of parts hereinafter set forth and more particularly pointed out in the claims appended hereto.

Reference is to be had to the accompanying drawing and forming a part hereof, in

j which- Figure 1 is a cross sectional view of a portion of a truck showing my improved spring arrangement,

Fig. 2 is a side elevation of the spring arrangement and bolster carried thereby, with parts of the truck being shown in dotted lines,

Fig. 3 is a sectional view on the line 83 of Fig. 2 looking in the-direction of the arrows,

Fig. at is a sectional view on the lines 44 of Fig. 3 looking in the direction of the arrows, and

Fig. 5 is a plan View of the supports which are located between the ends of the leaf springs.

Throughout the various views of the drawings, similar reference characters designate similar parts. In the preferred embodiment of my invention as disclosed in the accompanying drawing, 1 indicates the car sup porting bolster which is mounted upon elliptic springs. In the drawing, I have shown two elliptic springs placed side by side, but it will be understood that more springs can be used or a single elliptic spring can likewise be used.

At 2 is shown the lower half of each elliptic spring which rests upon a support 3 bolted toa portion of the frame indicated at 4. The lower half 2 of the spring is provided with the usual retaining band 5. Supported upon the lower half 2 is'the upper 7 half 6 which is provided with the usual retaining band 7, and which supports the bolster 1. Itwill be noted that the upper half 6 of the spring is of less capacity than the lower half. This arrangement permits the upper half 6 of the spring to support light weights, or in other words it takes the preliminary load imposed uponthe bolster such as the weight of the empty car body. As greater weight is imposed upon the car, the load is transferred to the lower and heavier half 2 of the spring as will be hereinafter explained.

Resting upon the lower half 2 at the ends thereof are supportsv 8 and the upper half 6 of each spring rests upon these supports. Each one of the supports comprises a plate 9 having end webs 10, central dividing webs 11 and studs 12. The ends of the springs 2 and 6 lie in the pockets formed by the space between the end webs 10 and central webs 11 and the springs are provided with slotted ends, as at 13, into which the studs 12 'pro jec-t. The upper and lower faces of the supports 8 are inclined asat 1i and 15 per mitting the springs 2 and 6 to be flexed without interference by the supports 8. The bolster 1 is provided with'a projecting end 16 having a fiat underface 17 which is adapted to contact with the upper side of the support 8. The support 8 at the opposite end of the spring is adapted to be contacted with by a surface18 provided on the underface of the bolster. The underface of V the bolster is arched or recessed as at 19 so that it clears the springs.

It will be seen from the foregoing that when a light load is imposed upon the truck the upper half 6, which is lighter and, therefore, more resilient than the lower half 2., yields to the shocks and jolts which it must absorb and in so doing insures easy riding under light loads. The upper half 6 which is of less capacity than the truck is designed for'will be compressed under loads which exceed its capacity causing the supports 8 to come in contact with the surfaces 17 and 18 of the bolster thus preventing its further deflection and preventing it from being over-stressed. All further spring motion is then imparted by the lower half 2 which is of suflieient capacity to carry the entire load. 7

From the foregoing, it is obvious that my so i invention is not to be restricted to the exact embodiment shown but is broad enough to cover all structures coming within the scope of the annexed claims.

What I claim is i. i 1. In a truck of the class described, a bolster, leaf springs supporting said bolster,

one of said leaf springs being supported upon the other and being :of less capacity than the other and means on said bolster for contactingwith the heavier spring after the lighter spring has beencompressed.

2. Ina truck of the class described, a bolster, a light leaf. spring supporting said bolster, a heavier spring supporting the light spring and means on the ends of thesprings for rereiving and supporting the bolster on the heavy spring after the light spring is compressed. i a i 3. In a truck of the class described, a bolster, an elliptic leaf spring supporting the same, the lower half of said spring being of greater capacity than the upper half and means at the ends of the lower half for receiving, and supporting the bolster on said lower half when the upper half is compressed. I

4Q In a truck of the class described, a bolster, an elliptic spring supporting the same, supports at the end of said springs, and means on thebolster adapted to contact with the said supports and cause the weight of the bolster and car to becarried by the lower half of thespring. i a

i 5. In atruck of the class described, a bolster,an elliptic spring supporting the same, said spring having its lower leaves of greater capacity than its upper leaves, supporting members disposed betweenthe ends of the upperand lower leaves and faces on the bolster adapted to contact with and rest upon the supports on compression of the upper leaves.

6. In a truck of the class described, a bolster, a leaf spring supporting the same, said spring having a lower half of greater capacity than its upper half, a supporting member arranged between the ends of the upper and lower halves of the spring, studs on said supporting member adapted to enter openings in the spring ends, and means on the bolster adapted to rest on the-support and cause the load to be carriedby the lower half of the spring.

7. In a truck of the class described, a bolster, a leaf spring supporting the same, one half of said spring being of greater capacity than the lower half and means for causing the load on the bolster to be carried by the ster, an elliptic leaf spring supporting the same, one of. the halves of said spring being of greater capacity than the other half, said bolster having a recessed portion overlying the spring and having faces adapted to contact with and rest on the half of said spring of greatest capacity when the weakest half of the spring is compressed.

Signed at the city and county. of Philadelphia, State of Pennsylvania, this 20th day of November, 1920.

y y ,ELMER LATSHAW. 

